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利用“神光-Ⅱ”装置第九路输出的倍频激光,采用直接驱动方式进行了金(Au)材料状态方程(EOS)实验。首先采用透镜列阵均匀辐照技术对输出的倍频激光进行了光束匀滑,平面靶实验结果显示冲击波具有良好的平面性,间接表明靶面上驱动激光强度的空间分布比较均匀。同时采用多台阶靶技术,对驱动冲击波的传播稳定性进行了实验测量,结果表明冲击波在实验测试的靶厚度范围内都是稳定传播的,实验结果与数值模拟结果也符合得较好。在此基础上,采用阻抗匹配方法,实验测量了金材料的状态方程,在金材料中获得了高达2.7 TPa的冲击压强,冲击波速度测量相对扩展不确定度达2%(K=2),并将实验数据与已有实验数据及状态方程模型进行了比较。
Using the double frequency laser output from the ninth output of SG-II device, the EOS experiment of gold (Au) material was carried out by the direct drive method. Firstly, the output laser beam was homogenized by uniform irradiation of lens array. The planar target experiment shows that the shock wave has a good planarity, which indirectly indicates that the spatial distribution of the driving laser intensity on the target surface is relatively uniform. At the same time, multi-step target technique was used to measure the propagation stability of the shock wave. The results show that the shock wave propagates steadily in the range of the target thickness. The experimental results are in good agreement with the numerical results. On this basis, impedance matching method was used to measure the state equation of gold material experimentally. The impact pressure up to 2.7 TPa was obtained in gold material, and the relative expansion uncertainty of shock wave velocity measurement was up to 2% (K = 2) The experimental data are compared with the existing experimental data and the equation of state equation.